Connolly Lake Dam Reservoir Report

Last Updated: December 5, 2025

Connolly Lake Dam, located in Freestone, Texas, serves a primary purpose of fire protection and as a stock or small fish pond.


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Summary

Built in 1950, this earth dam stands at a height of 9 feet with a length of 400 feet, providing a storage capacity of 157 acre-feet. The dam is situated on Mustang Creek and is owned privately, with state permitting and inspection required.

Despite its small size, Connolly Lake Dam poses a high risk potential, with a hazard potential assessment of "Not Available" and a risk assessment rating of "High (2)". The dam does not have a spillway and is equipped with one outlet gate. The condition assessment is listed as "Not Rated", indicating a need for further evaluation to ensure safety and stability. Although there are no associated structures or locks, the dam remains a crucial element for the local community's fire protection and water storage needs.

Water resource and climate enthusiasts may find Connolly Lake Dam an intriguing subject for study due to its unique features and risk profile. The dam's location on Mustang Creek and its history as a water storage facility for fire protection and fish stocking purposes add to its significance. Further research and monitoring of this dam could provide valuable insights into maintaining and improving water infrastructure in the region, ensuring both safety and sustainable water resource management for the future.

Year Completed

1950

Dam Length

400

Dam Height

9

River Or Stream

MUSTANG CREEK

Primary Dam Type

Earth

Surface Area

25

Hydraulic Height

9

Nid Storage

157

Structural Height

9

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

9
       
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Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.